Telegraphophone system



May 5, 1931. LE ROY J. LEISHMAN 03,555

TELEGRAPHOPHONE SYSTEM Original Filed Oct. 6, 1927 ,ef 26 L Z SW11 L erqyeZLezl sk n Patented May 5, 1931 LE ROY QLEISH'MAN, 015 Los ANGELES, oALIFonnIAfnssIGNdfi]"rELEcirRUJroiin CORPORATION,'OF LOS ANGELES, cAmronnI-A; aconronarionortran j p rnrlnenarnornonn sYsrnM Original application filed October 6,1927, Serial No. 224,468. Divided and 16, 1928. Serial n'msoobeo. V

This invention relates to electrical reproducers, and primaril'y'to-a simple andefa ficient apparatus for connecting an electrical pick-up for phonographs or telegraphophone sound box with the circuits of a radio receiving set so as to utilize the amplifier system thereof for reproducing phonograph selectionswithout materially altering the circuits of the radio set or interfering with its use as a receiverof radio signals at other times. 7 V r This application is a division of my application Serial Number 224,468, filed October 6, 1927.

visions are made for connecting an electrical pick-up forphonographs or telegraphophone sound box either with the grid circuit or the plate circuit of the detector tube of the radio set, preferably the grid circuit. order conveniently to connect the electrical'pick-j up with the radio set without altering any is used which fits the'prongs of the detector of the connections of the set, an apertured disk tube between the tube and the contacts of the detector tube socket, making'electrical connection with'either theplate' prong or the grid prong and also with the cathode prong when the usual AC tube is used or with one of the filament prongs if the old A battery tube is used. V r

The invention'will. be described in deta1l in connection with the accompanying drawingsand hereinafter claimed.

In the drawings 1 I Figure 1 is a circuit diagram showing the manner of connecting a phonograph electrical pick-up with the detector-grid circuit of a radio receiving set in accordance with my invention.

, s Figure 2 is an elevation view of the lower: portion of a radio detector tube with a disk in section to show contacts carried thereby for making connections with the pick-up in accordance with this invention. I

Figure 3 is a'plan view ofthe contact disk,

Referring to the drawings, Figurel shows,

the detector and first stage of the audio amplifier only of any standard typeof radio receiving set employing a detector and one or In accordance with this invention pro this application filed August more stages of audio amplification. The detector tube is generally designated by the reference numeral 11 and the" first audio electrical energy 1 Tatithe proper potentials,

the sources shown beingfA? and 9B bat teries, andthefdetector circuit inay be equipped with the usual tgridleakresistance 13 and grid condenser 14.

1- In accordance i WltllptllG present invention telegraphophone sound 1130x715: is connected with the radio receiving set soasto utilize the'ainplifier system thereof for reproducing phonograph, selections. Since the :dtector tube willremaln n ts. socket, and theclrcuit is not broken 1n any place, radiois'ignals transformer 12. I Theset is supplied 'with] an electrical pick-up v.for phonographs or willcomeithruunlessxone of the srad'iofre quency tubes. is removed. or, ras'will usually bethefcase, unless theiset is detnnedl: While Iihave'illustr'ated theset'usingboth .A -and ,B b atteries,the tubes usually employed will be the more InodernWAC tubes V a s The-electrical pick-up 15 is 'providedwith a connecting icable shown as. wires-1d Which provideelectrical;connections forlit with the rid circuit ofxjthe rad o set ,bylmeans ofa plug 17 which isadapted to be inserted .in a jack 18the terminals of, which are cono'fthekdetector tube insteadofato-the grid i.

terminal as preferred.

as h

-, A connector-for the electrical pick-up pref:

erably includesa very simple form ofzcont V motion which consists of v a f disk 22 shown in FiguresQ and This connectoron disk has fourfof'five holes for receiving the prongs of the detector :tube '11, depending on whether battery 01*AC, tubes are used.;- I-n the bat-- tery type, forexample,-one of the holes for ing the pronggiiand either theplatel f th v the filament terminals such as theonereceiw 1 gage the tube prongs, and wires and 26 are connected to these contacts. The connector is very snnllar to my ordlnary adapter, but provides simple and efliclent means for making connection Withthe tube prongs with the tube in place in the tube socket without materially displacing the tube or taking up a great amount of space in the radio receiving set, as the disk 22 slips on the base of the detector tube and the leads are suificiently small 3' and flexible to fit easily between the tube and thedold-fashioned socket should the latter be use In Figure 1, the preferred arrangement, the phonograph pick-up or telegraphophone is shown connected with the grid circuit of the detector tube, thus utilizing the amplifying efi'ect of this tube as well as the audio amplifiers and by means of its connection therewith excluding the passage of radio frequency currents to the detector tube. However, as above referred to, the connections could as readily be made with the plate circuit of this tube by arranging the contacts 24 of the disk for such plate circuit connections in which event the blocking condenser 20 in the case 19 is necessary. The standard case 19 with the condenser and variable resistance are shown in the circuit of the pick-up for connection with the grid circuit (Figure 1) the condenser although not essential in this circuit is not objectionable and is retained in the circuit as a' matter of convenience as a part of the standard equipment.

lVhat I claim is 1. In combination, a sound reproducer, a connector for making circuit connections with a radio tube consisting of contacts adapted to engage prongs of a radio tube while said tube is in its regular socket of a radio set and making all its normal electrical connections therewith, a supporting member for said contacts, and conductors connecting the reproducer and connector.

2. In combination, a jack, means for con necting said ack to a radio circuit, said means including a connector having contacts adapted to engage prongs of a radio tube while said tube is in its regular socket in a radio set and making all its normal electrical connections therein, a supporting member for said contacts and conductors connecting said contacts with the terminals of said ack.

3. The combination with a telegraphophone, of means for-connecting the telegraphophone to aradio receiving set including conductor' wires connected with the telegraphophone and a connector on the end thereof adapted to be positioned between the base of a tube and its mounting in the radio receiving set to connect the telegraphophone with one LE ROY J. LEISHMAN. 

